The ion exchange water purification process percolates water through spherical, porous bead resin materials (ion-exchange resins). Ions in the water are exchanged for other ions fixed to the beads. The two most common ion-exchange methods are softening and deionization. Softening is used primarily as a pretreatment method to reduce water hardness prior to reverse osmosis (RO) processing. The softeners contain beads that exchange two sodium ions for every calcium or magnesium ion removed from “softened” water.
Deionization (DI) beads exchange either hydrogen ions for cations, or hydroxyl ions for anions. That's ion exchange water purification process.
Power stations that generate electricity consume very large amounts of water.Other than raw cooling water, most of the water consumed requires treatment of some ion exchange form. Lanlang Ion exchange resins are initially used to produce ultra pure water from raw water often obtained from a standard domestic water supplies or well water. Both weak and strong acid cation resins and strong and weak base anion resins are exclusively used to remove all impurities from the source water. The weak acid cation resin removes a large proportion of the cationic species, for example, Iron, Fe2+,Fe3+ with a strong acid cation removing the remainder. Weak and strong base anion resins follow to remove the anionic impurities in the same way, for example, Silica, SiO2. The benefit of this configuration is that the regeneration of the resins is a highly efficient process with the regenerant from the strong resins being sufficient to regenerate the weak ones too.
As the feed water is recirculated any impurity pick up arising from a small ingress of during normal plant operation needs to be quickly and efficiently removed. An in-line Condensate Polishing Plant (CPP) uses strong acid cation and strong base anion resins for this purpose. These resins must be in peak performance in order to process the volume of fast flowing water (typically around 400 kg s-1) arising from normal operation.
Lanlang resins are widely used in the nuclear power industry for make-up demineralization, radwaste treatment and condensate polishing. These resins are available as standard, stand-alone products and are also available as custom designed products for specific specification needs.
Nuclear grade ion exchange resins must also have low levels of both organic and ionic impurities such that they do not leach any objectionable contaminants into the treated water.
Ion exchange is a very powerful technology to remove impurities from water and other solutions. Many industries depend on ion exchange for the production of extremely pure water.
• Nuclear and thermal power stations
• Semiconductor, computer chips and display panel production
• Removal of toxic contaminants from drinking water
There are also many applications in areas other than water treatment, in the food industry,chemical processes, catalysis, mining, waste decontamination and a lot more.
Some contaminants are not easy to remove by conventional ion exchange resins. In many cases, very specific resins have been developed for these contaminants. Selective resins are available today for the removal of:
• Cadmium, mercury and other heavy metals
and some other contaminants.
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